<format>
: Copy basic_format_args
in tuple
formatters when needed
#4681
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Fixes #4651.
Also
_Fmt_it
,_Fmt_wit
,format_context
, andwformat_context
with consistent alias templates; andbasic_format_context
specializations can still be well-formed, despite that they can't be actually called.Notes: LWG-4061 is now tentatively ready (although this PR doesn't speculatively implements it yet). Thus it should be now clear that
basic_format_context
objects can only be created by implementations, not user codes.